I have a project I am working on
I want to mix Egyptian Styles of music with Norwegian black metal.

As you can see, not exactly the easiest thing to do.
How should I approach this?

A big influence of this is Nile, mainly because they have an Egyptian sound to them that just sounds dead awesome.

any scales or modes I should learn in particular? Im working on Phrygian Dominant which has gave me some nice results
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just to be an arse for a second: actually, egyptian music was based on something much like our pentatonic scale, despite the fact that phrygian dominant seems to be synonymous with an "egyptian" sound.
that being said, look up locrian, double harmonic, and octatonic theyre all quite well suited to that sort of style, and dont forget about good old diminished